Ever since I got my tank, the one clown has not been lekka. It just parks off in a dark corner and does not eat. It comes to the surface when I feed the fish, but it rejects everything I've tried. I've tried flake, I've tried pellet, I've tried garlic soaks, I've tried vitamin solutions, I've tried mysis shrimp. I've tried meaty and veg varieties of all the prepared foods. Nada.

The little guy is looking bad - his orange is fading into a dull gray tan colour, and his fins are starting to look ragged.

All my other fish are fine and healthy and eating like pigs.

I can't see any obvious sign of disease or parasite or injuries. He is able to control his bouyancy well, so I dunno.

without a pic this is the best i can offer
1-Chilonodella
2-columnaris
3-amyloodinum
4-bacterial infection
5-Poision i.e. are there poisonous fish or animals in the tank ? do you have any reason to believe they may have released their poison or stung the affected fish? new landscape objects or equipment recently added, test for ammonia, nitrite, and nitrate if high could be problem,any perfumes, insecticides, cleaning chemicals, detergents, excessive tobacco smoke, oils or strong vapors been released into the tank water or sprayed near the tank or air intake recently. good luck hope something here helps.